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The EVK1104 offers advanced debug, trace and programming interfaces. These interfaces can be used with the Atmel tools like the AVRONE! and the JTAGICE mkII.
A NEXUS connector (J15 marked with NEXUS) offers fast debug and trace capabilities for the UC3A3.
The J16, 10-pin JTAG header, offers standard JTAG debugging and programming for the UC3A3. The header is marked with “JTAG”.
The AT32UC3A3256 USB DFU bootloader can be started by pressing the SW2 button upon reset (RESET button).
The JTAG header J33 can be used to program and debug the UC3B1 board controller. This header is not mounted by default and must be added if new firmware shall be written to the device.